Thread gripper



Oct. 27, 1953 M. BAR

THREAD GRIPPER Filed May 9, 1951 IN V EN TOR. MAX Bx'iz W ATT0l 2NEY.$

Patented Oct. 27, 1953 THREAD GRIBPERL Max Mr; Aixgslihrg Goggii'lgen; Germany; are

slg'mon to Khotex MaschinenUawG. ma Bi m;

Augshurgastadtberzen ortaGaerinanyt-- Germmm'aworporatibmi 7 Glaimsv. (ClM28i-499j:

'I his inventi'om relates'zto atthrewdilgripperrfom warp 1 knotting or tyings machines. i

flie -satisfactory flHlOtiOIllOf" thes thread gripet perbwwhichzthesl twmthreadsito besknotted 1130s gether areafed to thee knottingr tooli is' 01 dee oisive importance for the knotting processnandz thuse for" thew functiom at? the entire: machine. This :-satistaetoryrfunotionLot thei thread-1 gripper-e is impaired: bw the? fibrousa: material detaching: from the threads: the machine is" operating-.1

It is: amohjecti oiithezpresent invention'stonprm vide aathread grippemwlfloh. aVOidSithiSifliffinUlty? and is: simple; in: constmetiom and .1 operation:

Withthisv'andr further: obj eets iim view which'i will I hereinafter appear; according: to" the:- pressent'inven'tion the l-wgrippinga Jaws arezarranged: s01 as to' b'e open on all fsideseandi-the' gripping: surfaces themselves are designed' to issue onltheiri side facing away from :the drawing in side= 1mm an open: space intmwhich thedeposited; waste" fibres are discharged by thee thread" as;- itis; drawn in Thus? thechance? of deposition of: loose fibres in the region oi? the" gripping-=- jawsz isreduced to a minimum =and it is ensured"that the grippingj aws areltept 'free from obsttuc w tions--whic'h would impair their operations The" inventiom will be betterunderstood" hy" ref erenee'to the-i o11owing-- detailed i description in connection with theaccompanying drawing showing by way of'examplrand" purelirsche matiea'lly one" embodiment of the invention and in which? Fig: 1 is or side view of a thread gripperrhav ing the invention applied i therettu;

Fig: 211s an end view" thereof," and" Referring to-thedrawing: it willl'be" seerrthat the holder I of T the thread gripper has: a: cylindrical guide rim: its 'reciprocarmotlon; impart edto it by the'li'nk or lever 31 Arecess"4ofthe' holder" IL rides onxa: key 225 ofther guide: bolt: 21 so. as tQsecure, it against;turnir'ig'l The holder I" has a centrahbridgeportion iiservihafasz a; stationary abutment for the two gripping jaws B which are'fulcrumed at I on a pin 8 after the manner, of. 311133131106 been; saidtpintpxotnuding through a bore in the Iorkedmembers 9 of the holder I and beihg-acted upon; through the projections-=10, by a blade springs whose foroescam bezadiusted by, the wknurledflnuts l it through 'stud bolts" l3':-flXed. in theaholderz It s. v Each: gripping jaw]6Eisashaped..liketaskid attits two emls and bears at its front end a projection I4 protruding into a slot l5 at the ends of the forked part 9. On the other side each gripping jaw 8 is ally of the gripping; surfacesa 2 formed with a cheek l6 overhangingithexabutment b'ridg'e-t laterally of the grippirigjaws. saw jaw is recessed at: IT to form the: thread; contact surfaces These recesses. l1 therefore" willdetermine the position offthe threadfdirect 1y opposite" the fulcrum If and: accordingly? the: poiht of attack of the spring: force:

Inserted between 1 the:- lever 3-1 and: the. :fulcrum: 20 01? *the holder l is a lever: l8 having ;a handle l9 by which it can easily be swungtoutwtthez fulcrum point -20-'.'-'

It will thus: b'e seenathatr thee threadl contact: surfaces are fonnedlbly necessesi-ln -.cheeksz.ofr.thei gripping 'jawswhich' cheekssare arrangedglatenrinpinss jawse are advantageously? in: the: shape"; of" skids or-skis1=- Thus; contrary.:to the knownrdevioes; they: dmotfornx .aa collecting a on partition wall 1 for the wastefibres; Moreover: the; recesses-1. dew hirethe position of I the; thread; towardsboth. sides; whereby: a1 particularly reliablewgrippingz position is ensured! The construction-1' oicfthe threadcontact sunfaces according: to the: presentrginvention offers the possibility, in caseiofttgrippingij awsysuspendeed after: the mannenof a balancerbeam; to arrange the suspension; at a; point one the: other: sideof *the recesseszforming ;the :thread contact surfaeess Thiss ofi'ersa the": advantage thatthe; thread 1S1i61difltth8ll0iflt30f thermosttintensiveclamping pressures and: that an' absolutely safe clamping-r position; for? the: thread: is obtained whieh of courseaforms: an: edges-shaped support permitting f adaptation of: the: clamping 5 Jaw: in any position.

In order to knot?threads ofrdiflerent thickness: accord ing tmafurtherirfeaturez of the present in-- venti'on twmclamplng jawsxarewarrangedi onxboth sides: of a solid abutment sewing. simultaneously as a separatingwbas; whereby the wholew cone Stl'tmtibm of the: th'read gripper: is: simplified compared totheaconventionaiitypez ThGLSl'ZB OI; the thread grippier is further reduced: and zmadew more compaetby arranging the grippingjaws within -a*fork aocommodating zthe a movab'leaguide of its baianee beam support and-"provid'ed". omits: outertside w-itlfspnngs: more particularlyrblade springs: for producingthe clamping: pressures 15mins positiomof' the bladesprings' it isrgeasily posstbleito adilusvth'eir'spring force by normally operable 'set nuts -or set "screws brrto'interchange them--10! heavier springss the engagement of the guide projections of the clamping jaws on their draw-in side in slots of the forked ends the clamping jaws are simultaneously protected 3 against angular displacement. These slot guides are self-cleaning, so that soiling is prevented.

Although being efiiciently protected against premature soiling and disturbances, my novel thread gripper also has to be cleaned from time to time. To facilitate this cleaning, it may be loosely engaged on the guide. member serving for its reciprocal motion and moreover it may be adapted to be easily disengaged from its driving lever.

While the invention has been described in detail with respect to a now preferred example and embodiment of the invention it will be understood by those skilled in the art after understanding the invention that various changes and modifications may be made without departing from the spirit and scope of the invention and it is intended, therefore, to cover all such changes and modifications in the appended claims.

What is claimed is:

1. A thread gripper for warp lmotting ,machines, comprising a pair of gripping jaws which are open on all sides, means for suspending said.

abutment, spring means yieldably urging said jaw against said abutment, means for reciprocating said jaw and said abutment toward and away from thread to be gripped, said gripping surfaces having a thread inlet side, portions of said jaw and said abutment on the opposite side i thereof from said inlet side defining an unobstructed discharge opening forsubstantially complete ejection in each gripping operation of waste fibers accumulated at said gripping surfaces during a previous gripping operation.

3. Thread gripping mechanism for warp tying apparatus comprising a pair of gripping jaws, a stationary abutment coacting with said jaws,

means for pivotally mounting saidjaws on ope posite sidesof said stationary abutment, a recess on said'jaws forming gripping surfaces thereon, means for urging said gripping surfaces yieldably against said abutment, said urgingmeans and said mounting means coacting'for admitting at one side of said jaws thread to be gripped, and portions of said jaws and said abutment atthe side opposite to said admitting side defining a substantially unobstructed discharge space for ejection of waste fibre, accumulating at said grip:- ping surfaces as thread is inserted therein. 7

4. Thread gripping mechanism for warp tying apparatus comprising a curved gripping'jaw substantially open on all sides, a stationary abutment adjacent one edge of said jaw, one curved edge of said jaw partially overlying said abutment, a thread-receiving recess in said overlying edge, gripping surfaces on said jaw and said abut ment for gripping thread inserted therebetween urging gripping surfaces on said jaw yieldably,

against said abutment, said curved jaw and said abutment forming on one side of said recess a thread inlet to said gripping surfaces, and portions of said abutment and said jaw on the opposite side of said recess from said inlet side defining a discharge space for substantially complete ejection in each gripping operation of waste fiber accumulating between said gripping surfaces in a previous gripping operation.

5. Thread gripping mechanism for warp tying apparatusadapted to grip two threads to be tied comprising two oppositely disposed gripping jaws,

. a stationary abutment between said jaws adapted to be inserted between said two threads to be gripped, means for yieldably urging each of said jaws inwardly toward said abutment, a thread receiving recess on each said jaw at the side thereof adjacent said abutment, gripping surfaces on said jaws and said abutment at said recesses, one side of said jaws being outwardly curved forming on each side of said abutment a thread entrance to said gripping surfaces, the opposite side of said jaws being outwardly curved forming on each side of said abutment a substantially unobstructed discharge space for ejection of waste fiber from between said gripping surfaces.

6. Thread gripping mechanism for warp tying apparatus comprising a three prong frame memher having the center prong adapted to be inserted between threads to be grippecha pair of gripping jaws, means for pivotally mountings-aid jaws on the outside prongs of said frame member on opposite sides of said center prong, spring means for yieldably urging said jaws inwardly against opposite sides of said center prong, means for adjusting tension of said spring means, a bifurcation at the outer end of each outside prong, guide means ,on said jaws engaging said bifurcation, gripping surfaces on said jaws at the edge opposite to said pivotal mounting'engaging cooperating gripping surfaces on oppoable gripping jaw, a stationary abutment coactsaid source of power. 7

ing with said jaw, gripping surfaces on said jaw and said abutment for holding thread inserted therebetween, sliding means for mounting said mechanism for reciprocating motion toward and means, and means forreleasably engaging said lever means with said mechanism for selectively engaging or disengaging said mechanism from MAX BAR."

i References Cited in the like or thispatent UNITED STATES PATENTS" Noling i June 6, 1939 

